It is possible to obtain some space weather parameters such as the electron flux and mean energy of the precipitating electrons from the far ultraviolet (FUV)radiance of the aurora observed in a nadir viewing geometry, and the FUV image intensifier is one of the key equipment that used for observation the FUV radiance of the aurora in a nadir viewing geometry. The capability of this equipment will affect the whole purpose of the detection. And the responsibility to the wavelength is the most important parameter of image intensifier. Using the VUV beamline from synchrotron radiation as optical source, with PMT and Si-photodiode to detect the optical signal from synchrotron radiation and image intensifier separately, the authors measured the relatively spectral response distribution of our FUV image intensifier from 135 to 250 nm. The measurement result shows that the equipment can work well between 140 and 190 nm and the peak response is near 160 nm, and it can be used for our FUV aurora camera.